I hope you continue this, because ending it at this part is evil! I like your writing style, I think it goes well with this story.

Just some remarks:
- I think we know his name: Roy Walker - but honestly, it doesnt make any difference.
- Just a question: is it sheer accident that you named her sis Evelyn, like the nurse in the movie?
- The POV change is confusing in the end, and to be honest, I'm not sure I get why you changed, to begin with. I think you should either stick to third person (I'd choose that) or go with Alexandria POV, then (as I suppose) when Roy comes, switch to his POV.